<?php
/**
 * Zend Framework
 *
 * LICENSE
 *
 * This source file is subject to the new BSD license that is bundled
 * with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://framework.zend.com/license/new-bsd
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@zend.com so we can send you a copy immediately.
 *
 * @category    ZendX
 * @package     ZendX_JQuery
 * @subpackage  View
 * @copyright   Copyright (c) 2005-2008 Zend Technologies USA Inc. (http://www.zend.com)
 * @license     http://framework.zend.com/license/new-bsd     New BSD License
 * @version     $Id: Slider.php 15990 2009-06-11 08:19:28Z beberlei $
 */

/**
 * @see ZendX_JQuery_View_Helper_UiWidget
 */
require_once "ZendX/JQuery/View/Helper/UiWidget.php";

/**
 * jQuery Slider View Helper
 *
 * @uses 	   Zend_Json
 * @package    ZendX_JQuery
 * @subpackage View
 * @copyright  Copyright (c) 2005-2008 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 */
class ZendX_JQuery_View_Helper_Slider extends ZendX_JQuery_View_Helper_UiWidget
{
	/**
	 * Create jQuery slider that updates its values into a hidden form input field.
	 *
	 * @link   http://docs.jquery.com/UI/Slider
	 * @param  string $id
	 * @param  string $value
	 * @param  array  $params
	 * @param  array  $attribs
	 * @return string
	 */
	public function slider($id, $value = null, array $params = array(), array $attribs = array())
	{
		if(!isset($attribs['id'])) {
			$attribs['id'] = $id;
		}

		$jqh = ZendX_JQuery_View_Helper_JQuery::getJQueryHandler();

		$params = $this->initializeStartingValues($value, $params);
		$handleCount = $this->getHandleCount($params);

		// Build the Change/Update functionality of the Slider via javascript, updating hidden fields. aswell as hidden fields
		$hidden = "";
		if(!isset($params['change'])) {
			$sliderUpdateFn = 'function(e, ui) {'.PHP_EOL;
			for($i = 0; $i < $handleCount; $i++) {
				// Js Func
				if($i === 0) {
					$sliderHiddenId = $attribs['id'];
				} else {
					$sliderHiddenId = $attribs['id']."-".$i;
				}
				$sliderUpdateFn .= $this->getChangeCallback($jqh, $sliderHiddenId, $attribs['id'], $i);

				// Hidden Fields
				$startValue = $this->getHandleValue($i, $params);
				$hiddenAttribs = array('type' => 'hidden', 'id' => $sliderHiddenId, 'name' => $sliderHiddenId, 'value' => $startValue);
				$hidden .= '<input' . $this->_htmlAttribs($hiddenAttribs) . $this->getClosingBracket(). PHP_EOL;
			}
			$sliderUpdateFn .= "}".PHP_EOL;
			$params['change'] = new Zend_Json_Expr($sliderUpdateFn);
		}

		$attribs['id'] .= "-slider";

		if(count($params) > 0) {
			$params = ZendX_JQuery::encodeJson($params);
		} else {
			$params = '{}';
		}

		$js = sprintf('%s("#%s").slider(%s);', $jqh, $attribs['id'], $params);
		$this->jquery->addOnLoad($js);

		$html = '<div' . $this->_htmlAttribs($attribs) . '>';
		for($i = 0; $i < $handleCount; $i++) {
			$html .= '<div class="ui-slider-handle"></div>';
		}
		$html .= '</div>';

		return $hidden.$html;
	}

	protected function getChangeCallback($jqh, $sliderHiddenId, $elementId, $handlerNum)
	{
		if(version_compare($this->jquery->getUiVersion(), "1.7.0") >= 0) {
			return sprintf('    %s("#%s").attr("value", %s("#%s-slider").slider("values", %d));'.PHP_EOL,
			$jqh, $sliderHiddenId, $jqh, $elementId, $handlerNum
			);
		} else {
			return sprintf('    %s("#%s").attr("value", %s("#%s-slider").slider("value", %d));'.PHP_EOL,
			$jqh, $sliderHiddenId, $jqh, $elementId, $handlerNum
			);
		}
	}

	protected function getHandleCount($params)
	{
		if(version_compare($this->jquery->getUiVersion(), "1.7.0") >= 0) {
			return count($params['values']);
		} else {
			return count($params['handles']);
		}
	}

	protected function getHandleValue($handleNum, $params)
	{
		if(version_compare($this->jquery->getUiVersion(), "1.7.0") >= 0) {
			return $params['values'][$handleNum];
		} else {
			return $params['handles'][$handleNum]['start'];
		}
	}

	protected function initializeStartingValues($value, $params)
	{
		$values = array();
		if(isset($params['value'])) {
			$values[] = $params['value'];
			unset($params['value']);
		} else if(isset($params['values'])) {
			$values = $params['values'];
			unset($params['values']);
		} else if(isset($params['handles'])) {
			for($i = 0; $i < count($params['handles']); $i++) {
				$values[] = $params['handles'][$i]['start'];
			}
			unset($params['handles']);
		} else if(isset($params['startValue'])) {
			$values[] = $params['startValue'];
			unset($params['startValue']);
		} else if(is_numeric($value)) {
			$values[] = $value;
		}

		if(version_compare($this->jquery->getUiVersion(), "1.7.0") >= 0) {
			$params['values'] = $values;
		} else {
			$params['handles'] = array();
			for($i = 0; $i < count($values); $i++) {
				$params['handles'][$i]['start'] = $values[$i];
			}
		}
		return $params;
	}
}